Machine



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' W. SCOTT.

STOP CYLINDER PRINTING MACHINE. No. 295,057. Patented Mar. 11. 1884.

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W. SCOTT.

STDP CYLINDER PRINTING MACHINE. No. 295,057. Patented Mar. 11, 1884; I

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"ilnirnn TATES WALTER SCOTT, OF PLAINFIELD, NEW' JERSEY.

STOP-CYLINDER PRINTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 295,057, dated March 11, 1884.

Application filed March 29, 1893.

To aZZ whom' it may cancer/2 Be it known that I, VVALTER SCOTT, a sub ject of the Queen of Great Britain, residing at Plainfield, in the county of Union and State of New Jersey, have invented a certain. new and useful Improvement in Stop Cylinder Printing-Presses, of which the following isa specification.

My invention relates to that class of printing-machines which are'known as stop-cylinder presses, and the object of my invention is to provide a mechanism for starting, stopping, and holding the impressioneylinder in position while the form-bed is reciprocated one or more times for each impression taken. This object I accomplish by the devices illustrated in the accompanying ('lrawings, in which Figure l is a side view of a portion of a press with my improved starting, stopping, and hold in g mechanism applied thereto. Fig. 2 is a plan view of the same. Figs. 8 and 5 are side views of modified forms of construction, and Figs. 4 and 6' are plan views of the same.

Similar letters refer to similar parts through,

out the several views.

Upon the crank-shaft A, I loosely mount a box, a, which carries a sliding bar, B. In one end of this sliding bar B there is a slot, b, which :engages with a pin, 0, projecting from a toothed lever, G. This lever C is pivotedto the side frame of the press atd, and its upper end engages with theteeth of a segment, D, which is bolted to the end of the impressioncylinder E. flhis cylinder is mounted in the usual manner, and revolves once for every revolution of the crank-shaft, unless it is thrown out of gear in order to double-roll the form or stone.

Resting on the sliding bar B is a hook, F, one end of which is pivoted to the frame of the press, while the other end is arranged to engage with apin, e, projecting from the lever O. The sliding bar B is operated bytwo cams, G and H, said cams being attached to the crankshaft A, one on either side of the sliding bar. Two friction -.rollers, g and h, are carried by the bar 13, and ride on the faces of the cams G and H, by which arrangement a reciprocating motion is imparted to the barB I when the crank-shaft A is revolved.

anent with the pin a.

(N0 model.)

A coun tor-balance, I, is fixed to the projecting end-of the bar B, the object of which is to decrease the strain on the mechanism employed for lifting the bar. A gear-wheel, J, is secured to the crank-shaft A, and meshes with another gear-wheel, K, which is mounted on a short shaft, L, said gear-wheel K being twice the diameter of the gear J. A cam, i, is secured to the gear K by means of a setscrew, so that it can be disconnected when desired. A lever, M, pivoted by a shaft, j, sustained by the frame-work of the press, carries a frictionroller, is, which bears against the under side of the bar B. Secured to one side of the lower arm of this lever M is a connecting-rod, Z, one end of which is forked to straddle the'shaft L. This rod Z carries a frictionroller, an, which bears against the cam i.

when it is desired to pass the form or stone beneath the inking-rollers twice for each in1- pressi'on taken, the cam is secured to the gear K, and as suchgear is twice the diameter of the gear J, with which it meshes, it follows that the cam will make but one revolution to two revolutions of the crank-shaft. It may be here remarked that in presses of this character the bed is geared to make one complete excursion to each revolution of the crankshaft. As the cam *z'. strikes against the friction-roller m, it forces said roller outward and away from the shaft L, by which movement the lower end of the lever M, through the medium of the connecting-rod Z, is in turn forced downward, while the upper end of such lever, which carries the roller it, is raised, and by it the bar 13 and the hook F. This raising of the bar B breaks the connection between it and the lever G, and leaves the bar free to slide without moving the lever 0, said lever being then held in position by means of the hook F, which has been thrown into engage- It will thus be seen that at every second revolution of the crank-shaft the bar B will be thrown out of connection with the lever O, and consequently that the impression-cylinder will remain at rest.

0n the side of the lower arm of the lever M opposite to that to' which the rod Z is secured there is pivoted a second rod, 91, the other end of which is secured to an arm, 0, of a rock-shaft, p, which reaches across the press, and on its further end carries another arm, g, which engages with a rod projecting downward from a foot-treadle. It will be seen that by pressing the foot-treadle down the rockshaft 1) will be partially rotated and the lever M raised, thus breaking the connection between the rod B and the lever O and throwing the hook F into engagement with the pin 6. This means of holding the impression-cylinder at rest is resorted to when it is desired to-reciproc'ate the form-bed an indefinite number of times for each impression taken; but to prevent this operation while the cylinder is in motion I employ the following-described combination of devices: A bell-crank lever, N, is mounted 011 a short shaft, 1;, and connected at its upper end to a rod, t, which reaches to and straddles the shaft L, and carries a friction-roller, a, which bears against two cams, 1" 1*, which are secured to the shaft L. At the end of the lower arm of this lever N there is a catch, 10, which engages with a slot, 00, in the arm o'ofthe rock-shaft 1), thus preventing the shaft from being turned, eX-

. cept at such time as it is proper to trip the parts. As the cams r r are mounted on opposite sides of the shaft L, it will be seen that at each revolution of the crank-shaft A the rod twill be forced away from the shaft L,

thereby withdrawing the catch w from the slot 00, so that the operator can throw the bar B up and out of engagement with the lever 0. Another lever, O, which serves to hold the lifting'lever M inposition after it has been raised and prevent its return until the proper time, is secured to the side frame of the press at as. To the lower arm of this lever there is attached a rod, 1, which reaches to the shaft L, and is there operated, through the medium of a friction-roller, 2 by the cams z z. The upper end of this lever O is hooked and engages with a pin or lug, a, which projects from. the lever M, by which arrangement the" lever M is held up until the arrival of the proper time to lower the bar B. The lever M is kept from falling toward the crankshaft by the pin 0, which is fixed to the shaft j, and rides in a slot formed in the hub of the lever, as shown by dotted lines in Fig. 1.

In Figs. 3 and 4 I have illustrated a modification of my improved mechanism for controlling the action of the impression-cylinder, wherein the hook F is pivoted to the frame of the press below the bar B. In this case a short arm projecting from the hook bears against a rib, b, which is formed on the side of the bar B, and as the bar is raised so as to be clear of the lever C, the hook will drop onto the pin 0 and hold the lever in position. I have also shown in Figs. 3' and 4 another form of lifting device, which consists of a transverse lever, h, one end of which passes passes beneath a lifting-rod, while the other end reaches to the actuating mechanism,which is located at the opposite side of the press.

The lifting-rod 9 reaches up to and is pivoted to a double faced cam, f said cam being in turn pivoted to the frame of the press at k.

This cam is so formed that when the bar B is 76 raised in order to pass the form beneath the inking-rollers more than once for each impression taken, the cam is turned so that its surface i will bear against the bar B; consequently the bar B will havea flat, smooth surface to .ride upon.

In Figs. 5 and 6 I illustrate still another way of arranging the bar and hook. In this case but one pin is carried by the lever O, the hook F being, as usual, pivoted to the frame, but having a pin, 0, which rides in the slot d, formed in the bar B, so that when the bar B is raised andthrown out of connection with the lever O the hook F will be raised and brought into engagement with the pin which projects from the lever C.

It will be understood that, while I have described a specific mechanism for raising the sliding bar B, there are other mechanisms such as the one shown in my application No. 79,876, filed December 21,1882"'which will accomplish the same resul Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with the crank -shaft and sliding bar, of an impressioncylinder having a toothed segment, a toothed lever ing bar B, and mechanism, substantially as described, for reciprocating said bar, of gearwheels, as J K, a cam, as 2', a rod, as Z, a lever, as M, and tripping mechanism, substantially as described, adapted to be actuated by the operator for raising the upper end of the lever M, and thereby breaking the connection between the bar B and lever O, and keeping the said bar and lever disconnected at pleasure, as set forth.

3. The combination, with the bar B, of a lever, as M, connecting-rod, as a, arm, as 0, and rock shaft, as 19, substantially as described.

4. The combination, with the bar B, of a e I the same elevated at pleasure, all substantially with a catch, as w, a connecting-rod, as t, and 10 as set forth. 4 actuating-cams, as 'l 9", all arranged and com- 6. The combination, with the bar B and bined as and for the purpose specified. 5 lever M, of 21. lever, 21:50, a red, as 3 and aetu- W A LTER SCOTT.

siting-cams, as 2 z, substantially as described.

ing' the upper end of said lever and keeping rock-shaft, as p, asecond lever, asN, provided I I lVitn eases:

7. The combination, with the bar 13, of a EDWARD KENT, Jr. lever, as M, connecting-rod, as 91, arm, as 0, I G130. W. PERKINS. 

